<template>
  <div class="star" :class="starType">
    <span v-for="(itemClass,index) in itemClasses" :class="itemClass" class="star-item" :key="index"></span>
  </div>
</template>

<script>
  const LENGTH = 5
  const CLS_ON = 'on'
  const CLS_HALF = 'half'
  const CLS_OFF = 'off'

  export default {
    props: {
      size: {
        type: Number
      },
      score: {
        type: Number
      }
    },
    computed: {
      starType () {
        return 'star-' + this.size
      },
      itemClasses () {
        let result = []
        let score = Math.floor(this.score * 2) / 2
        let hasDecimal = score % 1 !== 0
        let integer = Math.floor(score)
        for (let i = 0; i < integer; i++) {
          result.push(CLS_ON)
        }
        if (hasDecimal) {
          result.push(CLS_HALF)
        }
        while (result.length < LENGTH) {
          result.push(CLS_OFF)
        }
        return result
      }
    }
  }
</script>

<style lang="stylus">
  @import "../../goshopping/common/stylus/mixin.styl"
  .star{
    font-size:0
    .star-item{
      display:inline-block
      background-repeat:no-repeat
    }
    &.star-48{
      .star-item{
        width:20px
        height:20px
        margin-right:22px
        background-size:20px 20px
        &:last-child{
          margin-right:0
        }
        &.on{
          bg-image('star48_on')
        }
        &.half{
          bg-image('star48_half')
        }
        &.off{
          bg-image('star48_off')
        }
      }
    }
    &.star-36{
      .star-item{
        width:15px
        height:15px
        margin-right:6px
        background-size:15px 15px
        &:last-child{
          margin-right:0
        }
        &.on{
          bg-image('star36_on')
        }
        &.half{
          bg-image('star36_half')
        }
        &.off{
          bg-image('star36_off')
        }
      }
    }
    &.star-24{
      .star-item{
        width:10px
        height:10px
        margin-right:3px
        background-size:10px 10px
        &:last-child{
          margin-right:0
        }
        &.on{
          bg-image('star24_on')
        }
        &.half{
          bg-image('star24_half')
        }
        &.off{
          bg-image('star24_off')
        }
      }
    }
  }
</style>
